Removable guide pin



Feb. 24, 1953 MARSlLlUs 2,629,615

' REMOVABLE GUIDE PIN Filed May 17. 1947 P'g.2 J'g-E:

INVENTOR. NEWMAN MMARSI IUS ATTORNEY Patented Feb. 24,1953

REMOVABLE GUIDE PIN Newman M. Marsilius, Trumbull, Conn., assignor toThe Producto Machine Company, Bridgeport, Conn., a corporation ofConnecticut Application May 17, 1947, Serial No. 748,800

An object of the invention is to provide for I use in a die set a diebed. having an opening therein of a diameter in excess of the diameterof a guide pin, a bushing having a press or other tight fit in saidopening, a guide pin the inner end of which has a snug fit in saidbushing and wherein said bushing and said guide pin or at least theinner end of the latter are hardened whereby repeated insertions andremovals of said guide pin into and out of said bushing may be madewithout wear of the opening in the die bed and will result in a minimumof wear on the bushing and pin.

Another object is to provide a structure as above set forth includingmeans for mechanically locking the inner end of the guide pin in thebushing and thus in the die bed.

Other objects and advantages of the invention will become apparent froma consideration of the following detailed description taken inconnection with the accompanying drawing wherein a satisfactoryembodiment of the invention is shown. However, it is to be understoodthat the invention is not limited to the details disclosed but includesall such variations and modifications as fall within the spirit of theinvention and the scope of the appended claim.

In the drawing:

Fig. 1 is a front elevational view of a die set in which the mounting ofthe guide pins in the base is in accordance with the present invention;

Fig. 2 is a sectional view on an enlarged scale showing in detail themounting of the inner end of one guide pin in the bed of a die set; and

Fig. 3 is a top plan view, on the scale of Fig. 2, of one portion of thedie bed and showing a guide pin mounted therein in accordance with thepresent invention.

Heretofore, it has been proposed to provide die sets with removableguide pins. These guide pins are hardened to avoid wear as the punchholder is moved on them while the bed of the die set is not hardened.Therefore, repeated insertion and removal of the guide pins into andfrom the die bed results in enlargement of the guide pin receiving holesin the die bed This is due to the fact that the die bed is of relativelysoft metal as compared with that of the pins. As a result of this wearin the die bed, the guide pins are not thereafter properly held and do 1Claim. (01. 287-20) not occupy exactly vertical positions and aresubject to lateral movements and tilting with respect to the die bed.

The present invention provides means whereby a die set may be equippedwith removable guide pins carried by the die bed and yet whereinrepeated insertion of the pins into and removal of the pins from the diebed results in no wear in the die bed and in extremely little, if any,wear in the other parts of the set. Thus, with the present construction,guide pins may be repeatedly inserted into and repeatedly removed from adie bed and yet on the next insertion will fit snugly in the openingsprovided for them and will not be subjected to casual movement relativeto the die bed.

Referring in detail to the drawing, at I0 is generally indicated a dieset including a punch holder II and a bed l2, the latter in accordancewith the invention carrying guide pins [3 arranged at right angles toits inner face. Punch holder II is provided with openings I l throughwhich the pins 13 extend and the pins being received in the openings [4serve to guide movements of the punch holder relative to the bed I2. Forconvenience, punch holder II is provided with a shank l5, as is usual inthe art.

The guide pins l3 are removably received in the bed 12. As abovesuggested, this bed is not of hard metal. However, the bed is providedwith cylindrical holes [6 of considerably greater diameter than thediameter of the inner end portions I! of the guide pins l3. In the holes15 are arranged bushings l8. These bushings are hardened and have pressfits in the holes it. Thus, the bushings form hardened liners for saidholes and having pressed fits therein, are securely held in place in thedie bed.

The pins I3 are hardened and their inner end portions I! are receivedwith snug fits in the cylindrical bushings [3. Intermediate the ends oftheir received end portions I1, the pins l3 are each provided with ahalf round groove l9 which is circular or which extends entirely aboutthe pins. When the guide pins are in place, hardened metal balls 2|] arepartially received in the grooves l9 and such balls are inserted throughopenings 2! entering through the forward edge of the die bed andopenings 22 through the bushings and aligned with the openings 2|.

These openings are radial with respect to the pins [3 and the opening 2|is, for at least a portion of its length, threaded. Through suchopenings, there are threaded cup point set screws 23, the inner or cuppoint ends of which are against and support the balls 20 in positionsbest illustrated in Fig. 2 Check nuts 24 may be provided on the outerportions of the set screws 23 for locking them in adjusted positions.

With the guide pins held in place by the hardened metal balls, asillustrated in the drawings, it will be clear that the guide pins aremechanically locked to the die bed 12. When, for any reason, the guidepins are to be removed, the check nuts 24 are eased off and the setscrews are then backed off with respect to the balls 20 whereby thelatter may move outwardly of the grooves I9 and the pins l3 thereafterremoved from the cylindrical holes through the cylindrical bushings 18.Any work having been done, the pins may be reinserted or new pins mayhave their inner ends inserted into the bushings and thereafter the pinsare locked in place with the balls 20 and set screws 23, as will beunderstood.

Since the pins are inserted in and removed from the bushings, it will beclear that there will be no wear with respect to the cylindrical holes[6 through the die bed and that regardless of the number of insertionsand removals of the pins, such holes will remain true. Since both thebushings and the guide pins are hardened, little if any wear will takeplace between these parts and thus even after long periods of use notonly will the bushings retain their press fit in the holes [6, but theinner ends of the pins will yet have snug fits in the cylindricalpassages through the bushings.

Having thus set forth the nature of my invention, what I claim is:

In combination, an elongated guide pin having a hardened inner endportion having an end surface and a cylindrical surface adjacent saidend surface, a soft metal body having a guide 4 pin receiving holetherethrough receiving the inner end portion of said guide pin, saidhole being oversize with respect to the inner end portion of said guidepin, a hardened bushing in and having a tight fit in said hole andextending for the length thereof through said body and having aninternal cylindrical surface axially unobstructed throughout its lengthof a diameter to snugly receive the inner cylindrical end portion ofsaid guide pin by axial insertion therein, said inner end portion of theguide pin having a groove axially spaced from said end surface andpresenting vertically spaced shoulders, said body and bushing havingaligned holes therethrough laterally aligned with said groove, andretaining means laterally movable in said holes from a released positionoutwardly of said internal surface of the bushing to a pin retainingposition inwardly of said internal surface to engage within said groovebetween said shoulders to thereby axially retain said pin in the angularposition of its insertion in said bushing. I

NEWMAN M. MARSILIUS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,444,352 Mason Feb. 6, 19231,621,811 Richard Mar. 22, 1927 1,638,261 Henricson Aug. 9, 19271,639,033 Grubman Aug. 16, 1927 1,825,449 Haller Sept. 29, 19311,978,957 Pardieck Oct. 30, 1934 2,013,488 Carrier Sept. 3, 19352,322,422 Danneman June 22, 1943 ,447,080 Meier Aug. 17, 1948

